Add an option to convert stringified number feature IDs to numbers

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.32.3
+
+* Add an option to convert stringified number feature IDs to numbers
+
 ## 1.32.2
 
 * Warn in tile-join if tilesets being joined have inconsistent maxzooms

README.md

@@ -352,6 +352,7 @@ resolution is obtained than by using a smaller _maxzoom_ or _detail_.
    `sum`, `product`, `mean`, `max`, `min`, `concat`, or `comma`
    to specify how the named _attribute_ is accumulated onto the attribute of the same name in a feature that does survive.
  * `-pe` or `--empty-csv-columns-are-null`: Treat empty CSV columns as nulls rather than as empty strings.
+ * `-aI` or `--convert-stringified-ids-to-numbers`: If a feature ID is the string representation of a number, convert it to a plain number to use as the feature ID.
 
 ### Filtering features by attributes
 

geojson.cpp

@@ -113,6 +113,13 @@ int serialize_geojson_feature(struct serialization_state *sst, json_object *geom
 						fprintf(stderr, "Warning: Can't represent non-integer feature ID %s\n", id->string);
 						warned_frac = true;
 					}
+				} else if (std::to_string(id_value) != id->string) {
+					static bool warned = false;
+
+					if (!warned) {
+						fprintf(stderr, "Warning: Can't represent too-large feature ID %s\n", id->string);
+						warned = true;
+					}
 				} else {
 					has_id = true;
 				}
@@ -125,13 +132,41 @@ int serialize_geojson_feature(struct serialization_state *sst, json_object *geom
 				}
 			}
 		} else {
-			static bool warned_nan = false;
+			bool converted = false;
+
+			if (additional[A_CONVERT_NUMERIC_IDS] && id->type == JSON_STRING) {
+				char *err = NULL;
+				id_value = strtoull(id->string, &err, 10);
 
-			if (!warned_nan) {
-				char *s = json_stringify(id);
-				fprintf(stderr, "Warning: Can't represent non-numeric feature ID %s\n", s);
-				free(s);  // stringify
-				warned_nan = true;
+				if (err != NULL && *err != '\0') {
+					static bool warned_frac = false;
+
+					if (!warned_frac) {
+						fprintf(stderr, "Warning: Can't represent non-integer feature ID %s\n", id->string);
+						warned_frac = true;
+					}
+				} else if (std::to_string(id_value) != id->string) {
+					static bool warned = false;
+
+					if (!warned) {
+						fprintf(stderr, "Warning: Can't represent too-large feature ID %s\n", id->string);
+						warned = true;
+					}
+				} else {
+					has_id = true;
+					converted = true;
+				}
+			}
+
+			if (!converted) {
+				static bool warned_nan = false;
+
+				if (!warned_nan) {
+					char *s = json_stringify(id);
+					fprintf(stderr, "Warning: Can't represent non-numeric feature ID %s\n", s);
+					free(s);  // stringify
+					warned_nan = true;
+				}
 			}
 		}
 	}

main.cpp

@@ -2541,6 +2541,7 @@ int main(int argc, char **argv) {
 		{"attribute-description", required_argument, 0, 'Y'},
 		{"accumulate-attribute", required_argument, 0, 'E'},
 		{"empty-csv-columns-are-null", no_argument, &prevent[P_EMPTY_CSV_COLUMNS], 1},
+		{"convert-stringified-ids-to-numbers", no_argument, &additional[A_CONVERT_NUMERIC_IDS], 1},
 
 		{"Filtering features by attributes", 0, 0, 0},
 		{"feature-filter-file", required_argument, 0, 'J'},

man/tippecanoe.1

@@ -424,6 +424,8 @@ that are dropped, coalesced\-as\-needed, or clustered. The \fIoperation\fP may b
 to specify how the named \fIattribute\fP is accumulated onto the attribute of the same name in a feature that does survive.
 .IP \(bu 2
 \fB\fC\-pe\fR or \fB\fC\-\-empty\-csv\-columns\-are\-null\fR: Treat empty CSV columns as nulls rather than as empty strings.
+.IP \(bu 2
+\fB\fC\-aI\fR or \fB\fC\-\-convert\-stringified\-ids\-to\-numbers\fR: If a feature ID is the string representation of a number, convert it to a plain number to use as the feature ID.
 .RE
 .SS Filtering features by attributes
 .RS

options.hpp

@@ -23,6 +23,7 @@
 #define A_EXTEND_ZOOMS ((int) 'e')
 #define A_CLUSTER_DENSEST_AS_NEEDED ((int) 'C')
 #define A_GENERATE_IDS ((int) 'i')
+#define A_CONVERT_NUMERIC_IDS ((int) 'I')
 
 #define P_SIMPLIFY ((int) 's')
 #define P_SIMPLIFY_LOW ((int) 'S')

tests/stringid/in.json

@@ -0,0 +1,6 @@
+{ "type": "Feature", "id": 12345, "properties": {}, "geometry": { "type": "Point", "coordinates": [ 1, 1 ] } }
+{ "type": "Feature", "id": "12345", "properties": {}, "geometry": { "type": "Point", "coordinates": [ 2, 1 ] } }
+{ "type": "Feature", "id": "12345.6789", "properties": {}, "geometry": { "type": "Point", "coordinates": [ 3, 1 ] } }
+{ "type": "Feature", "id": "9837489273489273894728943728903480989080938597489274389", "properties": {}, "geometry": { "type": "Point", "coordinates": [ 4, 1 ] } }
+{ "type": "Feature", "id": 9837489273489273894728943728903480989080938597489274389, "properties": {}, "geometry": { "type": "Point", "coordinates": [ 5, 1 ] } }
+{ "type": "Feature", "id": "1e5", "properties": {}, "geometry": { "type": "Point", "coordinates": [ 6, 1 ] } }

tests/stringid/out/-z0.json

@@ -0,0 +1,28 @@
+{ "type": "FeatureCollection", "properties": {
+"bounds": "1.000000,1.000000,6.000000,1.000000",
+"center": "1.000000,1.000000,0",
+"description": "tests/stringid/out/-z0.json.check.mbtiles",
+"format": "pbf",
+"json": "{\"vector_layers\": [ { \"id\": \"in\", \"description\": \"\", \"minzoom\": 0, \"maxzoom\": 0, \"fields\": {} } ],\"tilestats\": {\"layerCount\": 1,\"layers\": [{\"layer\": \"in\",\"count\": 6,\"geometry\": \"Point\",\"attributeCount\": 0,\"attributes\": []}]}}",
+"maxzoom": "0",
+"minzoom": "0",
+"name": "tests/stringid/out/-z0.json.check.mbtiles",
+"type": "overlay",
+"version": "2"
+}, "features": [
+{ "type": "FeatureCollection", "properties": { "zoom": 0, "x": 0, "y": 0 }, "features": [
+{ "type": "FeatureCollection", "properties": { "layer": "in", "version": 2, "extent": 4096 }, "features": [
+{ "type": "Feature", "id": 12345, "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 0.966797, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 1.933594, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 2.988281, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 3.955078, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 4.921875, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 5.976562, 1.054628 ] } }
+] }
+] }
+] }

tests/stringid/out/-z0_-aI.json

@@ -0,0 +1,28 @@
+{ "type": "FeatureCollection", "properties": {
+"bounds": "1.000000,1.000000,6.000000,1.000000",
+"center": "1.000000,1.000000,0",
+"description": "tests/stringid/out/-z0_-aI.json.check.mbtiles",
+"format": "pbf",
+"json": "{\"vector_layers\": [ { \"id\": \"in\", \"description\": \"\", \"minzoom\": 0, \"maxzoom\": 0, \"fields\": {} } ],\"tilestats\": {\"layerCount\": 1,\"layers\": [{\"layer\": \"in\",\"count\": 6,\"geometry\": \"Point\",\"attributeCount\": 0,\"attributes\": []}]}}",
+"maxzoom": "0",
+"minzoom": "0",
+"name": "tests/stringid/out/-z0_-aI.json.check.mbtiles",
+"type": "overlay",
+"version": "2"
+}, "features": [
+{ "type": "FeatureCollection", "properties": { "zoom": 0, "x": 0, "y": 0 }, "features": [
+{ "type": "FeatureCollection", "properties": { "layer": "in", "version": 2, "extent": 4096 }, "features": [
+{ "type": "Feature", "id": 12345, "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 0.966797, 1.054628 ] } }
+,
+{ "type": "Feature", "id": 12345, "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 1.933594, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 2.988281, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 3.955078, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 4.921875, 1.054628 ] } }
+,
+{ "type": "Feature", "properties": {  }, "geometry": { "type": "Point", "coordinates": [ 5.976562, 1.054628 ] } }
+] }
+] }
+] }

version.hpp

@@ -1,6 +1,6 @@
 #ifndef VERSION_HPP
 #define VERSION_HPP
 
-#define VERSION "v1.32.2"
+#define VERSION "v1.32.3"
 
 #endif